Valve seat grinder



Aug. 18, w BARBER VALVE SEAT GRINDER Filed Jan. 26, 1928 m m m.

Patented Aug. 18, 1931 PAT ENT OFFICE WILLIAM BARBER, OF BROOKLYN, NEW YORK VALVE SEAT GRINDER Application filed January 26, 1928. Serial No. 249,670. H

This invention relates to grinders, more particularly to those used in the. grinding of auto valve seats;

H The object of the invention is to provide a durable valve seat grinder, light in weight, cheap in manufacture, and positive and accurate in operation. I

A further object of my invention is to provide a grinder, the main body of which is provided with a plurality of apertures, making it adjustable to the various sizes of valve seats.

A still further object is to provide a grind or having automatic stop mechanism insur- 1 ing no more than required amount of grind lng.

With the grinders now in use, it too often happens that the seat'is ruined by over-grinding, especially with the use of 2 an electric motor or other high speed means.

In carrying out my invention, I provide a body portion having an upward extending shank to which the driving means is attached; and having a plurality of aperg tures through one of which extends a pivotal securing rod for holding grinder firmly to valve guide, and carrying a stationary gear wheel, and having extra sleeve members for the accommodation of the varioussizes of valves. Through another aperture is a shaft adapted to carry a grinding wheel, or other means, the downward movement, into the valve seat, of said wheel, is limited by limiting nuts on the shaft. The shaft is also provided with a gear wheel which meshes with gear on pivotal securing rod, and when in operation, produces a sun-andplanet motion. The downward pressure of the grinding wheel against the valve seat is kept constant by an expansion spring until the limit of descent is reached, whereupon the grinding wheel is automatically taken out of contact with the valve seat by means of a limiting nut coming in contact with upper surface of main body.

I ith the foregoing and other objects in view, the invention consists substantially in the construction, combination, location and relative arrangements of parts, all of which will be more fully set forth, and shown in the accompanying drawings, and finally pointed out in the appended claims; and while the invention is not restricted to' the exact details of construction, disclosed herein, still for the purpose of illustrating a practical embodiment thereof, reference is had to the accompanying drawings, in which like reference characters designate the same parts in the several views, and in which- Figure 1 is a vtop plan showing main body with shank, assembly nut, and limiting nut, also apertures for securing the rod and grinding wheel shaft, for various sizes of valves.

Figure 2 is a sectional elevation taken on line-22 of Figure 1,. showing grinding wheel in its lowermostposition.

Fig. 3 is a fragmentary view of the grinder and associated parts.

Fig. 4 is a sectional view taken on the line 4.i of Fig. 2.

Referring now more specifically to the drawings, is the body which is made preferably of anti-friction metal; The body has an upstanding drive shaft or shank 11 to which may be attached a crank, electric motor, orother driving means (not shown). 12 is the anchoring or securing rod or shaft which is provided with an upper nut 13 and friction washers 1 1 and 15 to permitsaid shaft to rotate in the body.- Said shaft fixedly supports the gear wheel 16, the adjusting sleeve 17, through which the shaft passes. 18 is a valve guide and 19 is a wing nut for securing the grinding device into position. The body portion 10 fits loosely upon the shaft 12 which acts as a pivotal rod and is free to turn while the shaft together with gear 16, and sleeve 17, is secured rigidly to valve guide 18 by the wing nut 19.] 20 is a valve seat, 21 and 22 are limiting nuts, 23 is a grinding wheel shaft which passes loosely through the body portion 10, and carries a compression spring 24 interposed between the body portion and the gear wheel 25, said gear being fastened on shaft 23. At the lower end of shaft 23 is a grinding wheel 26 securely held in place by adjusting nuts 27 and 28.

When a valve seat is to be ground the grinder is placed inposition as shown in Fig.

2. The wing nut 19 is screwed tight until shaft 23 is lifted and the spring compressed. as shown in Fig. 3.

The space 29 between the limiting nuts and the body portion indicates the amount which will be taken from the valve seat, because the grinding stops when nut 22 rests again on body portion. The body is provided with extra apertures 80,31, and 88, for the readjustment of the anchoring shaft and the grinding shaft when valvesof various sizes are to be ground.

Having described my invention What I claim and desire to secure by Letters Patent is as follows 1. In a valve seat grinding device, a body member having a drive shaft and a pinrality of apertures in said body, an anchoring shaft in one of said apertures for anchoring said grinding device to the valve guide by which the valve seat is to be ground, a gear on said shaft, a shaft parallel to said first named shaft having a gear thereon engaging said first named gear, a grinding element carried by said second named shaft, and means for constantly tensioning the grinding element onto the valve seat to a limited distance.

2. In a valve seat grinding device, a body member, a pair of shafts, one of said shafts being supportedupon the valve guide and engaging said body member to form an axis about which said bodyrmember may revolve, the other of said shafts supported by the body member and carrying a grinding element in cooperative relation with respect to the valve seat to be grouno, said shafts having intermeshing gears, whereby when said body member is revolved the grinding element will be axially rotated and simultaneously carried annularly around the valve seat, and means to rotate said body member upon said first mentioned shaft.

3. In a valve seat grinding device, a shaft fixedly mounted in centered relation to the valve to be ground, a body member mounted to revolve on said shaft as an axis, a grinder shaft carried by said body member in eccentric relation to the fixed shaft, a grinder element carried by the grinder shaft in cooperating relation to the valve seat to be ground, intermeshing gears respectively carried by said fixed shaft and grinder shaft,

and means to revolve said body member about said fixed shaft whereby said grinder is axially rotated and bodily moved in a path concentric with the valve seat.

4. In a valve seat grinding device, a shaft fixedly mounted in centered relation to the valve to be ground, a body member mounted to revolve on said shaft as an axis, a grinder shaft carried by said body member in eccentric relation to. the fixed shaft, a grinder element carried by the grinder shaft 111 cooperating relation to the valve seat to ground,

to revolve on said shaft as an axis, a grinder shaft carried by said body member in eccentric relation to the fixed shaft, a grinder element carried by the grinder shaft in cooperating relation to the valve seat to be intermeshing gears respectively carried by said fixed shaft and grinder shaft, means to revolve said body member about said fixed shaft whereby said grinder path concentric with the valve seat, and

means to yieldingly press the grinder to its working engagement with the valve seat to be ground.

6. In a valve seat grinding device, a shaft er shaft carried by said body member in 60%,

centric relation to the fixed shaft, a grinder element carried by the grinder shaft in cooperating relation to the valve seat to be ground, intermeshing gears respectively carried by said fixed shaft and grinder shaft,

V is axially rotated and bodily moved in a means to revolve said body member about said fixed shaft whereby said grinder is axially rotated and bodily moved in a path concentric with the valve seat, means to yieldingly press the grinder to its working,

engagement with the valve seat to be ground and means to adjustably limit the approach of the grinder towards the valve seat.

WILLIAM BARBER. 

